Knob-spindle attachment



(No Model.)

' H. ,K. J(;)NES.'* KNOB SPINDLE ATTACHMENT. No. 294,881. Patented Mar. 11, 1884.- v

NITEDI STATES FFICE.

PATE T i HORACE K. JONES, OF HARTFORD, ASSIGNOR TO THE RUSSELL & ERRVIN MANUFACTURING COMPANY, OF NEV BRITAIN, CONNECTICUT.

KNOB-SPINDLE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 294,881, dated March 11, 1884.

Application filed December 17, 1883. (No model.)

To-aZZ whom it may concern.-

Be it known that I, Honaon K. J ONES, a citizen of the United States, residing at Hartford, in the county of Hartford andState of cation.

My invention relates to improvements in knob-spindleattachments; and the object of my improvement is to provide africtional attachnient for connecting the knob to the spindle which shall be of simple construction, readily applied, and firm and substantial when applied. I attain this object by the simple construction illustrated in the accompanying drawings, in which Figure l is a'perspective view of my knobspindle and knob attached-thereto. Fig. 2 is an enlarged transverse section of the knobshank. Fig. 3 is an enlarged transverse section of theknob-spindle. Fig. 4 is an enlarged sectional view of the knob shank and spindle together. of my knob-spindle slightly modifiedin form; and Fig. 6 is an enlarged sectional View of the knob-shank for use in connection with the spindle, Fig. 5.

A designates the knob-spindle, and B the knob-shank. I provide the spindle at its ends and the socket in the knobshank each with alternate smooth circular holding-faces and relief-spaces, the same being so related to each other that when the knob -socket is placed upon the end of the spindle, with the reliefspaces in the socket directly opposite the holding-faces in the knob-socket, the knob can readily be slipped endwise on the spindle. By rotating the knob sufficiently to bring the holdingfaces of the socket and spindle directly opposed to each other, the knob will be firmly held in place.

I prefer to construct the spindle A of the ordinary square form, and to make the holding-faces by turning or milling off the corners, so that all of them constitute parts of one circle when viewed in end View, and for this reason I term them concentric circular faces, 7 7 although they may not be absolutely concentric with the axis of the spindle, which, when placed in the latch, is governed by the ordinary spin- Fig. 5 is an enlarged sectional View dle-hub. I also prefer to form the knob-socket of the ordinary square form large enough to receive a square spindle, and then ream or drill out the same to form the circular holdingfaces a, while the corners of theoriginal square of the socket form the relief-spaces Z). In the spindle the circular corners 0 form the holding-faces, and the remaining portions of the original square sides form the relief-spaces (7.

In order to prevent crowding, the reference letters for theholding-faces and relief-spaces are wholly omitted from Fig. 4 and omitted from the knob-socket in Fig. 1.

The circle on which the holding-faces of the 6 5 spindle is formed must be a little larger than the circle on which the holding-faces in the socket is formed so as to insure a snug fit.

In a square spindle made from five-sixteenths iron, and formed as shown in Figs. 1 to 4, inclusive, a variation of about two one-thousandths of an inch in the diameter of said circles is a proper variation for these parts IVith the parts thus constructed, the knob is 7 5 placed upon the spindle with the relief-spaces and holding-faces opposed to each other until the knob or knobs are brought into their desired position-with reference to the length of the spindle, after which sufficient force is ap- So plied to the knobs to turn them about oneeighth (e) of a revolution on the spindle, thereby crowding with considerable friction the holding-faces into engagement with each other, as shown in Figs. 1 and 4. If properly 8 5 constructed, the knob will be held in place with sufficient friction to prevent anyv accidental displacement of the knob, and it will remain in its place for use as long as may be desired.

The foregoing construction is given not only as the preferred form, but as the best construction known at present to me. The shape of the relief-spaces are, however, unimportant, and it is immaterialwhether the spindle has a greater or less number of smooth circular holding-faces, provided there be at least two such holding-faces and two relief-spaces on each socket and on each spindle end.

In Fig. 5 I have illustrated in transverse IO section a knob-spindle, A, having only three of the circular holding-faces, which are designated c. This spindle may be formed from a triangular rod, with its original sides forming the relief-spaces, as shown at d; or the spindle may be formed of a round or other shaped rod, and the relief-spaces may be milled out or otherwise formed and curved like the spaces (1.

In Fig. 6 I have shown a transverse section oi the knob-shank and socket 1 as adapted for use in connection with the spindle. Fif". 5. In this figure, a designates the holding-tacos, and Z) the relief-spaces. The attachment of the knob to the spindle in this modification is the same as in the construction first described.

I am aware that a prior patent shows and describes a frictional attachment for a knobspindle in which the spindle and socket are in the form of a snail-cam, the knob being adapt ed for being held in place by a partial rotation of a knob on the spindle. Such a knob-spire dle attachment is hereby disclaim ed. It contains only one rounded holding-face on each spindle end. Its faces are of scroll form in cross-section, instead of all being parts of one circle or circular. It has no reliefiaces. but the socket is made to slide easily on the knob by making the hole in the knob-shank and the spindle of a corresponding shapemith thehole of a larger size than the spindle. In my device the hole in the knob-shank is of a different shape from the knob-spindle, and instead of making the circular part of the hole in the knobshank the largest, I make it the smallest. The eccentric or cam shape is expensive to construct; the circular holdingi'aces are inexpensive to construct.

I am also aware that a prior patent shows a knob and square spindle, one end of which spindle is threaded on its corners, while the original square hole in the knob has been threaded to fit said threaded end of the spindle, in connection with a triangular key for fastening the knob against rotation by insert ing said key into one of the triangular spaces formed by the sides of the square spindle and square hole in the knob when thespi ndle stands cornerwise to the square hole in the knob. Such a knob attachment is hereby disclaimed.

I claim as my invention A knobspindle and socket provided each with two or more alternate concentric circular smooth holding-faces and relief-spaces, substantially as described, and for the purpose specified.

NORM ill 1K. JON ES. \Yitnesses:

HEXR Y E. .iUSsHLL, .lr., M. \Vmnn. 

